Table  4-20:  Energy Intensity of Passenger Modes,,,,,,,,,,,,,,,,,,
(Btu per passenger-mile),,,,,,,,,,,,,,,,,,
,,1960,1965 ,1970 ,1975,1980 ,1985,1990,1991,1992,1993,1994,1995 ,1996 ,1997 ,1998 ,1999 ,2000  
AirR,,,,,,,,,,,,,,,,,,
Certificated air carrier,,,,,,,,,,,,,,,,,,
  Domestic operations,,"8,633","10,118","10,185","7,746","5,727","5,047","4,932","4,671","4,564","4,558","4,444","4,382","4,183","R4,166","4,123","4,049","3,944"
  International operations,,"9,199","10,292","10,986","8,465","R4,339","5,103","4,546","4,609","4,258","4,099","4,145","4,173","4,108","4,168","4,278","4,123","4,009"
Highwayb,,,,,,,,,,,,,,,,,,
Passenger car,,"4,495","4,455","4,841","4,743","4,348","4,267","3,812","3,654","3,703","3,785","3,771","3,721","R3,688","3,657","R3,637","3,672","3,578"
Other 2-axle 4-tire vehicle,,N,N,"6,810","6,571","5,709","4,971","4,451","4,277","4,256","4,275","4,345","R4,538","R4,541","R4,564","R4,569","4,612","4,495"
Motorcycle,,a,a,"2,500","2,354","2,125","1,896","1,990","1,917","1,990","2,063","2,135","R2,274","R2,271","R2,273","R2,273","2,273","2,273"
Transit motor bus,,N,N,N,N,"2,742","3,396","3,723","3,767","4,038","3,944","4,162","4,155","4,196","4,228","R4,133","P4,044",U
Amtrak,,N,N,N,"2,383","2,164","2,094","2,064","1,978","2,035","2,023","1,935","1,838","2,148","2,200","2,138","2,107","2,134"
KEY: Btu = British thermal unit; N = data do not exist; P = preliminary; R = revised; U = unavailable.,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,
a  Included in passenger car.,,,,,,,,,,,,,,,,,,
"b  For 1995 and subsequent years, highway passenger-miles were taken directly from Highway Statistics rather than derived from vehicle-miles and average occupancy, as is the case for 1960-1994.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"NOTES: To calculate total Btu, multiply fuel consumed (see tables 4-21, 4-22, 4-24, 4-25) by 135,000 Btu/gallon for air carrier, 125,000 Btu/gallon for passenger car, other 2-axle 4-tire vehicle, and motorcycle, and 138,700 Btu/gallon for transit motor bus and Amtrak.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,2272.707556,,,,,,,,,,,,,,
SOURCES:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Air:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Certificated air carriers:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Passenger-miles:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"Air Transport Association, Internet site http://www.air-transport.org/public/industry as of Aug. 22, 2001.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Fuel consumed:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Internet site http://www.bts.gov/oai/fuel/fuelyearly.html as of Aug. 22, 2001.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Highway:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Passenger car:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"1960-94: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A. ",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"1995-2000: Ibid., Highway Statistics (Washington, DC:  Annual issues), table VM-1.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Other 2-axle 4-tire vehicle:,,,,,,,,,,,,,,,
"1970-94: Ibid., Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A.",,,,,,,,,,,,,,,
"1995-2000: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,,
Motorcycle:,,,,,,,,,,,,,,,
"1970-85: Ibid., Highway Statistics Summary to 1985, FHWA-PL-97-009 (Washington, DC:  July 1997), table VM-201A.",,,,,,,,,,,,,,,
"1990-2000: Ibid., Highway Statistics (Washington, DC:  Annual issues), table VM-1.",,,,,,,,,,,,,,,
Transit motor bus:,,,,,,,,,,,,,,,
"American Public Transportation Association, Public Transportation Fact Book (Washington, DC: March 2001), tables 30 and 65.",,,,,,,,,,,,,,,
Amtrak:,,,,,,,,,,,,,,,
"Amtrak, State and Local Affairs Department, personal communication.",,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,